On this day in Lewis & Clark history...
On his way back to Fort Mandan, Clark collects pumice stone and clay. Curious about the Indian way of making beads, he experiments by melting the pumice and clay in a furnace. The last of the six new canoes are carried to the river.
From the journals...
21st March Thursday 1805
I collected some Pumice Stone, burnt Stone & hard earth and put them into a furnace, the hard earth melted and glazed the other two a part of which i, e, the Hard Clay became a Pumice-Stone
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